improved rust LSP

neovim/.config/nvim/lua/LSPconfig.lua

@@ -35,7 +35,7 @@ end
 -- Use a loop to conveniently call 'setup' on multiple servers and
 -- map buffer local keybindings when the language server attaches
 -- the packages for these servers are: pyright, rust-analyzer, texlab, and lua-language-server
-local servers = { 'pyright', 'rust_analyzer', 'texlab'}
+local servers = { 'pyright', 'texlab'}
 for _, lsp in ipairs(servers) do
 	nvim_lsp[lsp].setup {
 		flags = {
@@ -44,6 +44,39 @@ for _, lsp in ipairs(servers) do
 	}
 end
 
+--rust configuration
+local rustOpts = {
+    tools = { -- rust-tools options
+        autoSetHints = true,
+        hover_with_actions = true,
+        inlay_hints = {
+            show_parameter_hints = false,
+            parameter_hints_prefix = "",
+            other_hints_prefix = "",
+        },
+    },
+
+    -- all the opts to send to nvim-lspconfig
+    -- these override the defaults set by rust-tools.nvim
+    -- see https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#rust_analyzer
+    server = {
+        -- on_attach is a callback called when the language server attachs to the buffer
+        -- on_attach = on_attach,
+        settings = {
+            -- to enable rust-analyzer settings visit:
+            -- https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/user/generated_config.adoc
+            ["rust-analyzer"] = {
+                -- enable clippy on save
+                checkOnSave = {
+                    command = "clippy"
+                },
+            }
+        }
+    },
+}
+
+require('rust-tools').setup(rustOpts)
+
 --lua-language-server needs seperate config.
 local runtime_path = vim.split(package.path, ';')
 table.insert(runtime_path, "lua/?.lua")

neovim/.config/nvim/lua/cmp-lsp.lua

@@ -19,7 +19,7 @@ for _, lsp in ipairs(servers) do
 end
 
 -- Set completeopt to have a better completion experience
-vim.o.completeopt = 'menuone,noselect'
+vim.o.completeopt='menu,menuone,preview,noinsert'
 
 -- nvim-cmp setup
 local cmp = require 'cmp'

neovim/.config/nvim/lua/packages.lua

@@ -17,6 +17,8 @@ return require('packer').startup(function(use)
 
 	use 'yamatsum/nvim-cursorline'
 
+	use 'simrat39/rust-tools.nvim'
+
 	use {'stevearc/dressing.nvim',
 		config=function()
 			require('dressing').setup{}
@@ -86,6 +88,12 @@ return require('packer').startup(function(use)
 		end
 	}
 
+	use {'glepnir/lspsaga.nvim',
+		requires = {
+			'neovim/nvim-lspconfig',
+		}
+	}
+
 	use {'hrsh7th/nvim-cmp',
 		requires = {
 			'neovim/nvim-lspconfig',